By using all 3 targets on the firing line, this allows the instructor to provide both a shoot or no shoot scenario as well as command training. Because each target has a "no-shoot" possibility for each string, some students will have to shoot at each command while others do not. This helps condition against "bunch shooting" where shooters shoot because everyone else is. V1 & V2 Red, Yellow, Blue. V3 Red and Black V4 Yellow, Blue, Green.